package Graph.graphWithNoweight.bfs;

import java.util.HashSet;

/**
 * @Author: 蔡翔
 * @Date: 2020/2/9 11:14
 * @Version 1.0
 */
public class TestMain {
    public static void main(String[] args) {
        HashSet<Integer> hashSet = new HashSet<>();
        hashSet.add(1);
        hashSet.add(1);
        hashSet.add(2);
        System.out.println(hashSet);
    }
}
